Code_lock

//libarys
#include <LiquidCrystal.h>
#include <Keypad.h>

// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(4, 5, 6, 7, 8, 9);

const byte ROWS = 4; //four rows
const byte COLS = 4; //four columns

//define the cymbols on the buttons of the keypads
char hexaKeys[ROWS][COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};

byte rowPins[ROWS] = {10, 11, 12, 13}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {A3, A2, A1, A0}; //connect to the column pinouts of the keypad

int digits, password;
bool PasswordIsVis = false;

Keypad customKeypad = Keypad( makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS);


void setup() {
  lcd.begin(16, 2);
  pinMode(2, OUTPUT);
  digitalWrite(2, LOW);
  Serial.begin(9600);
}

void passwordcon(char keys) {
  int key = keys - '0';
  Serial.println(key);
  Serial.println(digits);
  int setpassword = 1003;

  if (digits == 1) {
    password = 1;
  }
  password = password + key *  pow(10, 4 - digits);

  if (digits == 4 && password == setpassword) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Correct Password!");

    digitalWrite(2, HIGH);
    delay(1000);
    digitalWrite(2, LOW);

    password = 0;
    digits = 0;
  }
  else if (digits == 4 && password != setpassword) {
    digits = 0;
    password = 0;
    lcd.setCursor(0, 0);
    lcd.clear();
    lcd.print("Wrong Password!");
    delay(1000 * 4);
    lcd.clear();
  }
}

void loop() {
  lcd.setCursor(0, 0);
  lcd.print("Enter Password: ");

  // print the number of seconds since reset:
  char customKey = customKeypad.getKey();

  if (customKey) {
    lcd.setCursor(0, 1);
    digits++;
    passwordcon(customKey);
    if (PasswordIsVis == false) {
      for (int i = digits; i > 0; i--) {
        lcd.print("*");
      }
    }
    else {

      lcd.print(password);
    }

  }



}